Linear Fm Fixed Distance Fuse Rf Circuit And Antenna Design

Fuze which can use target information to make various ammunition timely initiation is an indispensable and important component of the weapon system. Fuze is playing more and more important role in modern war. LFM Fuze launch the same range of frequency modulation continuous wave signal, and use the substract frequency of the emission signal and the return siganl to determine the distance between the shells with the target. The frequency of the emission signal is changed in accordance with the modulation signal. LFM Fuze with its characteristics of hign precision and strong anti-interference ability is suitable for detection close distance.This article introduced the working principle of the LFM Fuze at the first, and analysised the beat signal. On this base the parameter's selection criteria of the triangel wave LFM Fuze was analysised. Finally, the thesis used the ADS software to simulate the LFM Fuze system and gave the principle diagram of the LFM Fuze's RF circuit.According to the principle diagram ,the various parts of the RF circuit were analysised and designed by the ADS software, so that they can meet the system's targets. At the same time two microstrip antennas were designed by the software of HFSS, the first one is circle antenna and the other one is conformal antenna. The two antennas are used for different occasions.Finally, the RF front-end circuit and antennas were designed the layout by AUTOCAD, and then they were created and debuged. As one of the most important parts of this design this article compared the results between the simulation results with debuged ones and put forward the reasons for the error and improving measures.